Gree AC Error Codes & Troubleshooting Guide [Error Finder Tool]

Find Gree AC error codes explained fast. Learn what each code means, common causes, and simple fixes to get your AC cooling again today.

Gree AC error codes appear on the indoor display or through LED blinks whenever the unit’s protection system detects a fault. These codes span several groups, including E1 to E9, F-series, H-series, L-series, P-series, and U-series codes. Each one points to a specific part of the system that needs attention.

Some codes signal simple issues you can check yourself, like a dirty filter, loose wiring, or a voltage problem. Others, such as compressor, IPM, or refrigerant leak codes, need a licensed technician. This guide gives you a quick-reference code table, causes and fixes for every code, a DIY safety checklist, and clear signs it’s time to call a professional like Urban Service Plaza.

Quick Answer – Gree AC Error Code Chart

Not sure what your Gree AC error code means? Use this quick-reference table to find your code and fix instantly.

Find your code below, then jump to the full explanation.

Error Code	Meaning	Quick Fix
E1	High-pressure protection	Clean condenser; check outdoor fan and airflow
E2	Indoor anti-freezing protection	Clean filters; check refrigerant and blower
E3	Low-pressure protection	Check for refrigerant leak; recharge if needed
E4	Compressor exhaust high temperature	Clean condenser; check refrigerant and airflow
E5	Overcurrent protection	Check supply voltage; use stabilizer if unstable
E6	Communication error	Inspect wiring; tighten terminals
E8	High temperature protection	Improve ventilation; check sensors and PCB
E9	Water-full protection	Check drain pump/float switch; clear blockage
EE	EEPROM/main PCB fault	Restart unit; replace PCB if error persists
EH	Thermal relay error	Check compressor overload relay and wiring
F0	Refrigerant leakage protection	Leak test; repair and recharge refrigerant
F1	Indoor ambient sensor error	Check sensor wiring; measure resistance
F2	Indoor tube (evaporator) sensor error	Verify sensor placement; replace if faulty
F3	Outdoor ambient sensor error	Inspect wiring; replace sensor if required
F4	Outdoor tube sensor error	Check wiring; replace sensor or PCB
F5	Exhaust temperature sensor error	Check wiring; measure resistance
F6	Overload limit frequency	Check compressor load; inspect inverter PCB
F7	Outdoor tube-exit sensor error	Check sensor wiring; replace if faulty
F8	Frequency reduction due to overload	Inspect load, refrigerant, and airflow
F9	Exhaust temp sensor 2 error (digital)	Check sensor wiring; measure resistance
FA	Oil temp sensor 1 error (fixed-frequency)	Check sensor wiring; replace if faulty
FB	Oil temp sensor 2 error (digital)	Check sensor wiring; replace if faulty
FC	High-pressure valve error	Inspect valve and refrigerant pressure
FD	Low-pressure valve error	Inspect valve and refrigerant pressure
H0	Heating defrost mode	Normal operation; no repair needed
H3	Compressor overload protection	Check compressor current and refrigerant charge
H4	System abnormality	Inspect sensors, PCB, compressor, refrigerant
H5	IPM protection	Check inverter PCB and IPM cooling
H6	Indoor fan motor error	Rotate blower; check wiring and motor
H7	Compressor desynchronization	Inspect compressor, inverter module, wiring
HC	Power factor correction protection	Inspect power supply and PFC circuit
L3	Outdoor fan motor error	Rotate fan; check wiring and motor resistance
L9	Overpower protection	Check compressor load and power supply
LC	Compressor startup failure	Check compressor windings and inverter PCB
LD	Compressor phase loss protection	Inspect compressor wiring and inverter output
LE	Compressor stall/mechanical jam	Inspect terminals; replace compressor if seized
PL	DC bus low voltage protection	Check incoming voltage and rectifier circuit
PH	DC bus high voltage protection	Measure supply voltage; inspect inverter PCB
P5	Phase current protection	Check compressor current and inverter module
P7	Heat sink sensor error	Measure resistance; replace sensor if faulty
P8	IPM module overtemperature	Clean unit; check cooling airflow
U1	Compressor phase current circuit error	Inspect current sensing circuit and PCB
U3	DC bus voltage drop	Check input voltage and DC bus capacitors
U5	Unit current detection error	Inspect current sensor and inverter PCB
U7	Four-way valve abnormality	Inspect valve coil and wiring

How to Read the Gree AC Error Code Display?

Gree ACs show faults in two ways. Most models display a direct alphanumeric code, like E1, F2, or H6, on the indoor unit’s screen. Some outdoor units instead use blinking LED patterns to signal the same faults.

Before you diagnose any code:

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First Thing to Try for Any Error Code?

Before digging into a specific code, try these quick steps. They solve many common faults without any tools or technical knowledge, and only take a few minutes.

1. Note the displayed error code before switching off the unit.
2. Turn off the AC and disconnect power for 5–10 minutes, then restart it.
3. Check if the error clears. If not, inspect wiring harnesses and connectors for looseness, damage, or corrosion.
4. Clear dust and debris from the indoor and outdoor units, since overheating can trigger several protection codes.

Caution: Only handle visual inspection and power resets yourself. Leave sensor testing, PCB work, and refrigerant handling to a licensed technician.

Gree AC Error Codes Explained With Solutions

E-Series Error Codes

E1 – High Pressure Protection

Meaning: This code appears when refrigerant pressure in the system rises too high.

Possible Causes:

• Overcharged refrigerant puts extra strain on the system.
• A dirty condenser coil blocks heat release.
• Outdoor fan malfunction or blocked airflow stops proper cooling of the refrigerant.
• High ambient temperature makes the condenser work harder than normal.

Troubleshooting:

• Check refrigerant pressure using gauges to confirm the fault.
• Clean the condenser coil if it’s dirty and blocking airflow.
• Verify the outdoor fan is spinning and working correctly.
• Remove any airflow restrictions around the outdoor unit.
• Recover excess refrigerant if the system is overcharged.

E2 – Indoor Anti-Freezing Protection

Meaning: The indoor evaporator temperature drops too low, so the system triggers this code to prevent ice buildup.

Possible Causes:

• A dirty air filter restricts airflow across the evaporator.
• Low airflow or low refrigerant reduces heat exchange.
• An indoor fan problem slows air movement over the coil.

Troubleshooting:

• Clean or replace air filters to restore normal airflow.
• Check the indoor blower for proper operation.
• Inspect refrigerant charge and top up if low.
• Verify the evaporator sensor is reading correctly.

E3 – Low Pressure Protection

Meaning: Refrigerant pressure has dropped too low, often pointing to a leak somewhere in the system.

Possible Causes:

• A refrigerant leak reduces overall pressure.
• A blocked capillary tube or expansion device restricts flow.
• Low refrigerant charge from the start also triggers this code.

Troubleshooting:

• Check operating pressures with gauges to confirm low pressure.
• Locate and repair any leaks in the refrigerant lines.
• Recharge refrigerant to the manufacturer’s specified amount.

Refrigerant leak repair and recharging should only be done by a certified technician. Contact Urban Service Plaza’s expert technician for affordable gas leakage inspection and AC gas refilling service in Kolkata & nearby areas.

E4 – Compressor Exhaust High Temperature

Meaning: The compressor’s discharge temperature has risen above a safe limit.

Possible Causes:

• Low refrigerant reduces the cooling effect inside the compressor.
• A dirty condenser or poor airflow traps heat in the system.
• A faulty exhaust temperature sensor can also trigger a false reading.

Troubleshooting:

• Clean the condenser to improve heat exchange.
• Check refrigerant charge and correct if needed.
• Inspect the exhaust sensor for damage or wear.
• Ensure the outdoor fan is running correctly to cool the unit.

E5 – Overcurrent Protection

Meaning: Compressor or system current has exceeded safe operating limits.

Possible Causes:

• High or low input voltage puts stress on the compressor.
• Compressor overload from mechanical strain increases current draw.
• An electrical fault elsewhere in the system can also cause this.

Troubleshooting:

• Measure supply voltage to check for instability.
• Use a voltage stabilizer if power fluctuates often.
• Check compressor current against rated values.
• Inspect the inverter PCB for faults.

E6 – Communication Error

Meaning: The indoor and outdoor units have lost communication with each other.

Possible Causes:

• A broken communication wire interrupts the signal.
• Loose terminal connections cause intermittent contact.
• PCB failure on either unit can also block communication.

Troubleshooting:

• Inspect communication wiring for breaks or damage.
• Tighten all terminal connections.
• Test both indoor and outdoor PCBs to rule out failure.

E8 – High Temperature Protection

Meaning: This code signals that high temperature resistance protection has activated to protect the system from heat damage.

Troubleshooting:

• Improve ventilation around the unit to reduce heat buildup.
• Check cooling airflow for blockages.
• Inspect sensors and the PCB for faults if the issue continues.

EE – EEPROM/Main PCB Fault

Meaning: This code points to an EEPROM memory failure or a general PCB malfunction.

Troubleshooting:

• Restart the unit first, since this sometimes clears the fault.
• Replace or repair the main PCB if the error keeps returning.

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F-Series Error Codes

F0 – Refrigerant Leakage Protection

Meaning: The system has detected refrigerant leakage or entered a related protection mode.

Troubleshooting:

• Leak test the refrigeration system to find the source.
• Repair any leaks found during testing.
• Recharge refrigerant correctly once the leak is fixed.

Refrigerant recharge work should only be handled by a licensed technician, since it involves pressurized gas and specialized tools.

F1 – Indoor Ambient Temperature Sensor Error

Meaning: The indoor ambient temperature sensor is not reading correctly.

Possible Causes:

• A loose sensor loses proper contact with the circuit.
• Damaged wiring interrupts the signal.
• A faulty sensor or indoor PCB failure can also cause this.

Troubleshooting:

• Check sensor placement to confirm it’s seated correctly.
• Inspect the connector for damage or looseness.
• Measure sensor resistance and compare it to spec.
• Replace the sensor if it tests faulty, or replace the indoor PCB if the sensor tests fine but the error remains.

F2 – Indoor Tube (Evaporator) Sensor Error

Meaning: The sensor monitoring the indoor evaporator tube is malfunctioning.

Possible Causes:

• The sensor may be disconnected from its socket.
• A faulty sensor or indoor PCB failure can also trigger this code.

Troubleshooting:

• Verify the sensor’s placement on the evaporator tube.
• Check the wiring for damage or looseness.
• Measure resistance to confirm sensor condition.
• Replace the sensor or PCB as needed.

F3 – Outdoor Ambient Temperature Sensor Error

Meaning: The outdoor ambient temperature sensor is giving an incorrect reading.

Possible Causes:

• A faulty ambient sensor fails to read temperature accurately.
• Wiring damage or an outdoor PCB fault can also be the cause.

Troubleshooting:

• Check sensor mounting to confirm it’s secure.
• Inspect wiring for cuts or corrosion.
• Measure resistance and compare to manufacturer specs.
• Replace the sensor or outdoor PCB if required.

F4 – Outdoor Tube Sensor Error

Meaning: The sensor on the outdoor condenser tube is malfunctioning.

Possible Causes:

• A faulty condenser pipe sensor gives an incorrect reading.
• A wiring fault or outdoor PCB fault can also trigger this.

Troubleshooting:

• Inspect the sensor for damage or poor contact.
• Check wiring for breaks.
• Measure resistance to confirm the fault.
• Replace the sensor or PCB if necessary.

F5 – Exhaust Temperature Sensor Error

Meaning: This code points to a fault with the exhaust temperature sensor. The source material doesn’t list separate causes for this code.

Troubleshooting:

• Check sensor wiring for damage or loose connections.
• Measure resistance to test the sensor.
• Replace the sensor if it tests faulty.

F6 – Overload Limit Frequency

Meaning: The compressor’s frequency is limited to protect the system from overload.

Troubleshooting:

• Check compressor load to see if it’s running beyond normal limits.
• Verify operating conditions like ambient temperature and airflow.
• Inspect the inverter PCB for faults.

F8 – Frequency Reduction Due to Overload

Meaning: The compressor’s speed is reduced automatically to prevent overload damage.

Troubleshooting:

• Inspect the overall system load.
• Check refrigerant charge levels.
• Verify airflow is not restricted at the indoor or outdoor unit.

Other F-Series Codes (F7, F9, FA, FB, FC, FD) – Brief Reference

A few F-series codes appear only in Gree’s summary chart without detailed causes or fixes listed. These include F7 (outdoor tube-exit sensor error), F9 (exhaust temperature sensor 2 error, digital models), FA and FB (oil temperature sensor 1 and 2 errors), and FC and FD (high and low-pressure valve errors). As general guidance, check wiring and measure resistance first, and only replace the specific sensor or valve after testing confirms it’s faulty. Since FC and FD involve pressure valves, it’s best to get these diagnosed by a professional technician.

H-Series Error Codes

H0 – Heating Defrost Mode (Not a Fault)

This code simply means the unit is running its normal heating defrost cycle. It’s not a fault and needs no repair.

H3 – Compressor Overload Protection

Meaning: The compressor has triggered overload protection.

Troubleshooting:

• Check compressor current against rated specifications.
• Verify refrigerant charge is correct.
• Inspect the condenser and airflow for blockages.

H4 – System Abnormality

Meaning: This is a general protection mode that activates when the system detects an unspecified fault.

Troubleshooting:

• Inspect sensors, PCB, compressor, and the refrigerant system to identify the root cause.

H5 – IPM (Inverter Power Module) Protection

Meaning: The inverter power module has triggered its protection function.

Troubleshooting:

• Check the inverter PCB for faults.
• Verify compressor current is within normal range.
• Inspect cooling of the IPM module.

H6 – Indoor Fan Motor Error

Meaning: The indoor fan motor is not operating correctly.

Possible Causes:

• The fan motor may be seized and unable to spin.
• A loose connector or faulty motor can also cause this.
• Indoor PCB failure is another possible cause.

Troubleshooting:

• Rotate the blower manually to check for resistance.
• Check wiring connections to the motor.
• Measure motor resistance against spec.
• Replace the motor or indoor PCB if faulty.

H7 – Compressor Desynchronization

Meaning: The compressor has lost synchronization with the inverter drive.

Troubleshooting:

• Inspect the compressor for mechanical issues.
• Check the inverter module for faults.
• Verify all wiring connections are secure.

HC – Power Factor Correction Protection

Meaning: The power factor correction circuit has triggered a protection response.

Troubleshooting:

• Inspect the power supply for irregularities.
• Check the PFC circuit and inverter PCB for faults.

L-Series Error Codes

L3 – Outdoor Fan Motor Error

Meaning: The outdoor fan motor is not working as expected.

Possible Causes:

• The fan motor may be seized.
• A wiring fault or outdoor PCB failure can also trigger this.

Troubleshooting:

• Rotate the fan manually to check for resistance.
• Check wiring for damage.
• Measure motor resistance to confirm the fault.
• Replace the motor or outdoor PCB if faulty.

L9 – Overpower Protection

Meaning: The system has triggered protection due to excess power draw.

Troubleshooting:

• Check compressor load for signs of overwork.
• Verify power supply is stable.
• Inspect the inverter PCB for faults.

LC – Compressor Startup Failure

Meaning: The compressor failed to start correctly.

Troubleshooting:

• Check compressor windings for continuity.
• Verify the inverter PCB is functioning properly.
• Inspect the power supply for stability.

LD – Compressor Phase Loss Protection

Meaning: The system has detected a missing phase in the compressor’s power supply.

Troubleshooting:

• Inspect compressor wiring for loose or missing connections.
• Check inverter output across all phases.
• Test compressor windings for continuity.

LE – Compressor Stall / Mechanical Jam

Meaning: The compressor has stalled or jammed mechanically.

Possible Causes:

• A locked compressor can’t turn freely.
• Burnt terminals or mechanical failure inside the compressor are common causes.
• Outdoor PCB failure can also be responsible.

Troubleshooting:

• Inspect compressor terminals for burn marks.
• Check winding continuity with a multimeter.
• Check for a ground fault in the compressor.
• Measure PCB output to rule out electrical faults.
• Replace the compressor if it’s mechanically seized.

This is one of the more serious Gree error codes. Compressor replacement should always be handled by a trained technician.

P-Series Error Codes

PL – DC Bus Low Voltage Protection

Meaning: The inverter’s DC bus voltage has dropped below the safe threshold.

Troubleshooting:

• Check incoming voltage for drops or instability.
• Inspect the inverter PCB for faults.
• Verify the rectifier circuit is working correctly.

PH – DC Bus High Voltage Protection

Meaning: The inverter’s DC bus voltage has risen above the safe threshold.

Troubleshooting:

• Measure supply voltage to check for spikes.
• Inspect the inverter PCB for damage.
• Verify overall power quality.

P5 – Phase Current Protection

Meaning: Current in one of the compressor’s phases has exceeded safe limits.

Troubleshooting:

• Check compressor current against rated values.
• Inspect the inverter module for faults.
• Test compressor windings for continuity.

P7 – Heat Sink Sensor Error

Meaning: The sensor monitoring the inverter’s heat sink is malfunctioning.

Troubleshooting:

• Check the heat sink sensor for damage.
• Measure resistance to confirm the fault.
• Replace the sensor if it tests faulty.

P8 – IPM Module Overtemperature

Meaning: The inverter power module has overheated.

Troubleshooting:

• Clean the outdoor unit to improve airflow.
• Check cooling airflow around the module.
• Inspect the IPM module and its thermal compound for wear.

U-Series Error Codes

U1 – Compressor Phase Current Detection Circuit Error

Meaning: The circuit that detects compressor phase current is malfunctioning.

Troubleshooting:

• Inspect the current sensing circuit for faults.
• Check the inverter PCB for related issues.

U3 – DC Bus Voltage Drop

Meaning: The inverter’s DC bus voltage has dropped unexpectedly.

Troubleshooting:

• Check input voltage for stability.
• Inspect DC bus capacitors for wear or failure.
• Test the inverter PCB for faults.

U5 – Unit Current Detection Error

Meaning: The system’s current detection circuit is not reading correctly.

Troubleshooting:

• Inspect the current sensor for damage.
• Check the inverter PCB for related faults.

U7 – Four-Way Valve Abnormality

Meaning: The four-way valve, which switches between cooling and heating modes, is not working correctly.

Troubleshooting:

• Inspect the four-way valve coil for damage.
• Check wiring connections to the valve.

When to Call a Professional AC Technician?

Some Gree error codes are not safe or practical to fix on your own. Watch out for these red flags:

If you spot any of these signs, it’s time to call in an expert. Urban Service Plaza offers doorstep AC repair across Kolkata, backed by ISO 9001:2015 certification. They service all AC brands, even if your unit is out of warranty or your AMC has expired.

Let’s Wrap Up

Most Gree AC error codes trace back to a handful of common issues: faulty sensors, loose wiring, unstable voltage, or blocked airflow and refrigerant problems. A simple power restart clears many of these faults on the spot. However, codes tied to the compressor, IPM module, or refrigerant leaks need a trained technician’s attention.

Understanding Gree AC error codes helps you decide when a quick fix is enough and when to call for help. If your error code persists after these basic checks, book a technician with Urban Service Plaza for reliable, doorstep AC repair.